161894833 has 2 divisors, whose sum is σ = 161894834. Its totient is φ = 161894832.

The previous prime is 161894813. The next prime is 161894867. The reversal of 161894833 is 338498161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98644624 + 63250209 = 9932^2 + 7953^2 .

It is an emirp because it is prime and its reverse (338498161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161894833 - 2²¹ = 159797681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161894833.

It is not a weakly prime, because it can be changed into another prime (161894813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80947416 + 80947417.

It is an arithmetic number, because the mean of its divisors is an integer number (80947417).

Almost surely, 2^161894833 is an apocalyptic number.

It is an amenable number.

161894833 is a deficient number, since it is larger than the sum of its proper divisors (1).

161894833 is an equidigital number, since it uses as much as digits as its factorization.

161894833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 43.

The square root of 161894833 is about 12723.7900407072. The cubic root of 161894833 is about 545.0181886587.

The spelling of 161894833 in words is "one hundred sixty-one million, eight hundred ninety-four thousand, eight hundred thirty-three".